Method and device for producing a structured varnish surface

Abstract

The invention relates to a method for producing a structured, at least partly optically transparent varnish surface on a surface of a substrate board, preferably of a wood material board, having a decoration. The steps of the method include applying a transparent or at least partly transparent varnish to an applicator roll thereby producing a structured varnish surface and transferring the structured varnish surface to a substrate board having a decoration. The varnish is applied to the applicator roll by a plurality of digitally controlled nozzles in a distribution defining a structure and/or is transformed on the applicator roll into a distribution defining a structure. Furthermore, a device for carrying out the method is described.

The invention claimed is: 
     
       1. A method for producing a structured, at least partly optically transparent varnish surface on a surface of a substrate board comprising the steps of:
 applying a transparent or at least partly transparent varnish as a film of varnish to an applicator roll, 
 transforming the film of varnish on the applicator roll, by a plurality of digitally controlled nozzles, into a distribution defining a three dimensional structure, and 
 transferring the structured varnished surface by the applicator roll to the substrate board having a decoration. 
 
     
     
       2. The method according to  claim 1 , wherein the varnish is transformed into such a distribution on the applicator roll that the structure resulting from the distribution of the structured varnish surface produced on the surface of the substrate board defines pores which match a decor image of the decoration. 
     
     
       3. The method according to  claim 1 , wherein before the varnish is transferred to the substrate board a decor image of the decoration or a guide mark placed on the substrate board is detected by an optical scanner, and measuring signals generated by the optical scanner are used to control the digitally controlled nozzles. 
     
     
       4. The method according to  claim 1 , wherein the varnish applied to the applicator roll is pre-dried or pre-cured on the applicator roll. 
     
     
       5. The method according to  claim 1 , wherein the varnish is applied as the film of varnish to the applicator roll by a metering roll and/or by a doctor. 
     
     
       6. The method according to  claim 1 , wherein the applicator roll comprises a substantially smooth applicator roll varnish-receiving lateral surface region. 
     
     
       7. The method according to  claim 1 , wherein the applicator roll is a rubberised and/or bowed applicator roll. 
     
     
       8. The method according to  claim 1 , wherein the varnish contains hard particles. 
     
     
       9. A device for producing a structured, at least partly optically transparent varnish surface on a surface of a substrate board, comprising:
 an applicator roll for transferring a structured varnish surface to a surface of a substrate board having a decoration; 
 and a plurality of digitally controlled nozzles wherein the nozzles are configured to transform on the applicator roll a transparent or at least partly transparent varnish, which has been applied to the applicator roll as a film of varnish, into a distribution defining a three-dimensional structure. 
 
     
     
       10. The device according to  claim 9 , wherein the digitally controlled nozzles are arranged in at least one row along the rotational axis of the applicator roll. 
     
     
       11. The device according to  claim 9  wherein the device further comprises an optical scanner, wherein the optical scanner is arranged upstream of the applicator roll in a feed direction of the substrate board to detect a decor image of the decoration or a guide mark placed on the substrate board, wherein the optical scanner is connected to a controller, and wherein the controller digitally controls the nozzles, subject to the measuring signals generated by the scanner. 
     
     
       12. The device according to  claim 9 , wherein the digitally controlled nozzles are formed as gas nozzles. 
     
     
       13. The device according to  claim 9 , further comprising a radiation emitter or a heater, wherein the radiation emitter or the heater is associated with the applicator roll and configured to pre-dry or pre-cure the varnish applied and structured on the applicator roll. 
     
     
       14. The device according to  claim 9 , wherein a metering roll and/or a doctor, are associated with the applicator roll to produce the film of varnish on the applicator roll. 
     
     
       15. The device according to  claim 9 , wherein the applicator roll comprises a substantially smooth varnish-receiving lateral surface region. 
     
     
       16. The device according to  claim 9 , wherein the applicator roll is rubberised and/or bowed. 
     
     
       17. The method according to  claim 1 , wherein the digitally controlled nozzles are formed as digitally controlled gas nozzles. 
     
     
       18. A device for producing a structured, at least partly optically transparent varnish surface on a surface of a substrate board, comprising:
 an applicator roll for transferring a structured varnish surface to a surface of a substrate board having a decoration; 
 and a plurality of digitally controlled nozzles wherein the nozzles are configured to transform on the applicator roll a transparent or at least partly transparent varnish, which has been applied to the applicator roll as a film of varnish, into a distribution defining a structure, 
 wherein the device further comprises an optical scanner, wherein the optical scanner is arranged upstream of the applicator roll in a feed direction of the substrate board to detect a decor image of the decoration or a guide mark placed on the substrate board, wherein the optical scanner is connected to a controller, and wherein the controller digitally controls the nozzles, subject to the measuring signals generated by the scanner.